auth-implementation-patterns

# Authentication & Authorization Implementation Patterns Build secure, scalable authentication and authorization systems using industry-standard patterns and modern best practices. ## Use this skill when - Implementing user authentication systems - Securing REST or GraphQL APIs - Adding OAuth2/social login or SSO - Designing session management or RBAC - Debugging authentication or authorization issues ## Do not use this skill when - You only need UI copy or login page styling - The task is infrastructure-only without identity concerns - You cannot change auth policies or credential storage ## Instructions - Define users, tenants, flows, and threat model constraints. - Choose auth strategy (session, JWT, OIDC) and token lifecycle. - Design authorization model and policy enforcement points. - Plan secrets storage, rotation, logging, and audit requirements. - If detailed examples are required, open `resources/implementation-playbook.md`. ## Safety - Never log secrets, tokens, or credentials. - Enforce least privilege and secure storage for keys. ## Resources - `resources/implementation-playbook.md` for detailed patterns and examples. ## When to Use Master authentication and authorization patterns including JWT, OAuth2, session management, and RBAC to build secure, scalable access control systems. Use when implementing auth systems, securing APIs, or debugging security issues. Covers: Authentication & Authorization Implementation Patterns, Safety.